package com.grocery.interceptor;

import com.grocery.util.SYS;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class UserLoginInterceptor implements HandlerInterceptor {
    //在Handler处理之前执行
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //检查请求是否有登录状态
        HttpSession session = request.getSession();
        Object obj=session.getAttribute(SYS.USER_LOGIN);
        //判断是否存在登录数据
        if(obj!=null){
            return true;
        }else {
            String path = request.getContextPath();
            String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
            response.sendRedirect("/page/mycount");
            return false;
        }
    }
    //在Handler处理之后立即执行
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }
    //一个请求结束spring框架访问后执行
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
